Typewriting machine



May 20 1924.

A. G. F. KUROWSKI TYPEWRI TING MACHINE Filed Sept. 4. 1920 a 2 Sheets-Sheet 1 Affome y May 20 1924.

A. G. F. KUROWSKI TYPEWRITING MACHINE 4.. 1920 2 Sheets-Sheet 2 Filed S ept.

l/rvenfon- Patented May 20, 1924.

UNITED STATES PATENT OFFICE.

ALFRED G. F. KUROWSKI, 0F BROOKLYN, NEW YORK, ASSIQNOR TO UNDERWOOD TYPEWBITER COMPANY, OF: NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPEWBITING MACHINE.

Application filed September 4, 1920. Serial No. 408,227.

To all whom it may canoe m:

Be it known that I, ALFRED G. F. KUnoW- SKI, a citizen of the United States, residing in Brooklyn Borough, in the county of Kings, city and State of New York, have invented certainnewand useful Improvements in Typewriting Machines, of which the following is a specification. y

This invention relates to ribbon-vibrating mechanism, and is illustrated as applied to an Underwood portable typewriter, in which the platen may occupy different case-shift positions.

Part of the ribbon-vibrating mechanism is applied to the shiftable frame which carries the platen, and part to the fixed frame. The connections between these parts are such that the shifting movement of one relatively to the other has no effect upon the'proper operation of the ribbon-vibrating mechanism.

This invention provides a lever for actuating the ribbon-vibratin mechanism to expose either of two color elds of the ribbon to the printing type by varying the point of connection of an actuating link.

The invention also provides for a neutral position in which the ribbon will not be vibrated, which is a condition desirable for stenciling. This is likewise accomplished by shifting the point of connection of the actuating link.

Other features and advantages will hereinafter appear.

In the, accompanying drawings,

Figure 1 is a skeleton perspective of the improvement applied to the machine, parts of the latter being broken away.

Figure-2 is a plan of the device, showing the color-control lever in one of the extreme positions.

Figure 3 is a view similar to Figure 2, parts of the latter being removed in order to show clearly the middle or neutral position of the color-control lever.

F i are 4 is a view similar to Figure 3, showing the color-control lever in the other extreme position.

Figure 5 is a side elevation of the springguiding and holding means, showing the arm of the color-control lever held beneath one of the springs.

Character-keys 1, when actuated, move key-levers 2 about a common fulorunrplate 3, fixed to the main frame '6 of the machine.

arms 31.

The machine is provided with the usual parts comprising a carriage 10, carried by a shift-frame 7 supported on the main frame 6. Said carriage rides upon rail 4 and carries a platen 11 journaled in end walls 12 (only one of which is shown). The key-- levers operate a universal bar 15' rigidlyf fixed upon shaft 16 journaled in brackets (not shown) fixedto the frame of the ana-" chine,'said bar operating against suitable return-springs (not shown) to rock arm 17 This arm carries a horizontal rod 18-h'avingahead 19engagingbehind the slotted end 20 of a horizontally-disposed dog-rocker 21. This rocker is pivoted at 22 and has a simi lar pivot below to enable it to oscillate abouta vertical axis and carries fixed and-mo"- able dogs 23 and 24, respectively,engaging the teeth of the escapement-wheel 25 .in the usual manner. The shaft which carries the escapement-wheel is provided with a pinion 26 meshing with feed-rack 27 of the carriage. I o the front guide-rail is secured a guide 30 having :two upwardly-extending The ribbon-vibrator is a forked member 32 having arms 33 terminating in elongated slotted portions 34 through which a ribbon 39 is drawn. The portions 34: carry fingers 35 which slide along the arms 31. The guide-plate 30 is shouldered at 36 and the lower end of the vibrator projects through a slot 87 in the shoulder.

The ribbon 39 comprises two fields of different colors, and either may be brought into printing position by mechanism now to be described. Color-control lever 40 is operated by finger-piece 41. and is pivoted at 42 on bracket 4.3 carried by plate {it fixed to the frame of the machine. The lever 40 may be shifted to three positions on the frame, the notch 45 being provided to assist in locating it in its central position; a lug 46 on said lever co-operating with the notch. Near the end of an arm of lever 40 there is fixed a pin 47 to shift the ribbon-vibrating mechanism hereinafter described.

The end 48 of the arm 50, better shown inlFigures 2-5, is adapted to co-operate with spring means carried on the fulcrum-plate 3. This spring means comprises a fixed plate 51 on whlch are mounted springs 52 and 53, each provided with: slots 54 and 55,

respectively, through. which pass screws 57,

bers on one side (the upper one 56 being shown). A screw 57 passes through said forked members. On the other side the sprin members terminate in ends 60 and 61 slight y raised above the plate 51, and having their ends spaced apart, and adapted to co-operate with the end 48 of arm to lock the arm in position. For this purpose, detents 62 on springs and 61 seat in depressions 63 of the arm 50. It is clear that the arm 50 has three positions with respect to the spring-members, i. e., under spring 61, between springs 60 and 61, and under spring 60. e

or arm having a horizontal extension 71 provided with a slot, said slot being adapted to lie over the spring-members 60 and 61. Operating in the slot is pin 72, rigidly attached to and projecting down from link or arm 73 pivoted horizontally at 74 on the horizontal projection of a bell-crank 75 pivoted (on the front rail 4 of the frame 7) at 76 for movement in a vertical plane. The link 7 3 terminates in forked members adapted to engage the pin 47 on the arm 50. The end of an arm 77 of the bell-crank 75 is in the form of a fork 78 slidable on the shoulder of stud 79 attached to the lower end of the ribbon-vibrator 32.

From the above-described linkage, it will be seen that movement of the rocker-arm imparts similar movement to the slotted por tion 71. The slot carries with it the pin 72 drawing link 73 forward, oscillating bellcrank 75 to lift the end 78 vertically, thus raising the ribbon-vibrator. The amount which the vibrator is raised. or, in other words, the throw of the ribbon, depends upon the position of the pin 72 in the slot, and hence upon the position of the end of the arm 50 with respect to the springs, since the end of arm 73 is moved by the pin47 on arm 50. v

Referring to Figure 2, it will be seen that a bell-crank lever is formed, one arm of which is the distance from pivot 22 to the teeth of the escapement-wheel 25 (or the rocker-arm), and the other arm is the distance from pivot 22 to the pin 7 2. Since the end of the rocker-arm moves through the same distance in each instance, the end of the other arm moves through a greater distance the farther removed it is from pivot 22. Thus, by moving pin 72 to the Figure 4 position to the end of the slot (by moving arm 50 to spring 61), the end of the leverarm will move about twice as far as in the Figure 2 position. Ann 73 will move twice as farforward and lift end 78 (and hence the ribbon-vibrator) twice as high. So that in such position with the parts as in Figure 4. Figure 3 shows the neutral position, for upon rotation of the rocker, and hence the slotted extension 71, the pin 72 will not be engaged by the member 71, due to the lostmotion connection. The slot is enlarged as shown at 81, to provide sufficient free play, so that pin 72 will not contact therewith through the movement of the rocker. The ribbon will therefore not be vibrated when the pin 72 is opposite the enlarged slot 81. This condition is desirable for the purposes of stenciling.

It is, of course, apparent that the settings of Figures 2, 3 and 4 are accomplished merely by operating lever 40 by the fingerpiece 11 to any of the three positions indicated.

From the description, it may be seen that shifting of the movable frame 7, which carries the dog-rocker 21 and the bell-crank or ribbon-vibrator lever 75, will not affect the action of the linkage, for all of the linkage between the ribbon-vibrator and the pin 47 will be raised. The pin remains stationary but is made of such length that the forks 80 contact therewith even in the elevated position.

Thelong slot in 20 at the end of the dog rocker serves a similar purpose, member 19 contacting with the sides thereof even in elevated position.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. In a typewriting machine, the combination of a main frame, a platen-supporting shift-frame on the main frame, escapement mechanism including a do -rocker, the dog-rocker being supported on t e shiftframe, a ribbon-vibrator on the shift-frame, vibrator-operating connections on the 'shiftframe between the dog-rocker and the ribbon-vibrator, said connections being adjustable to vary the extent of the movements imparted to the ribbon and thereby to control the field of the ribbon which is effective, and means on the main frame for controlling theadjustment of said connections.

. 2. In a typewriting machine, the combination of a ribbon-vibrator, a bell-crank connected to said ribbon-vibrator, an escapement mechanism including-a dog-rocker, an arm fixed to said dog-rocker to move therewith and having an elongated slot, a link attached to said bell-crank, and a stud on said link co-operating with said slot so that movements of said dog-rocker will oscillate said ribbon-vibrator, said link being shiftable to change the position of said stud in said slot to vary the throw imparted to the ribbon-vibrator from the dogrocker.

3. In a typewriting machine, the combination of a verticallymovable ribbonvibrator, a bell-crank connected to said ribbon-vibrator to swing in a plane parallel to the plane in which the ribbon-vibrator is disposed, an escapement mechanism including a horizontallydisposed dog-rocker mounted for movement about a vertical axis, a horizontal arm fixed to said dog-rocker to move therewith, and a link pivotally attached to said bell-crank, and connectible at various positions on said arms, so that movements of said dog-rocker will oscillate said ribbon-vibrator through various distances.

4. In a typewriting machine, the com bination of 'a main frame, a platen-supporting shift-frame on said main frame, a ribbon-vibrating mechanism, an escapement mechanism including a dog-rocker mounted for movement about a vertical axis, a horizontal arm fixed to said dog-rocker to move therewith and having an elongated slot, means including a horizontally-disposed link attached to said ribbon-vibrating mechanism, said link having a member adapted to co-operate with said slot, and a bell-crank control-lever pivoted on said main frame and connected to said link for moving said member to various portions of said slot, so that movements of said rocker will oscillate said ribbon-vibrating mechanism through various distances, the connection between the bell-crank control-lever and said link being such to permit the link to be shifted vertically with the shift-frame without disturbing said connection.

5. In a typewriting machine, the combination of a ribbon-vibrating mechanism, an escapement mechanism including a horizontally-disposed dog-rocker mounted for movement about a vertical axis, a horizontal member fixed to said dog-rocker to move therewith and having an elongated slot, a linkage attached to said ribbon-vibrating mechanism and comprising a link having a forked end and a member adapted to cooperate with said slot, and means for moving said member to various portions of the slot so that movements of the rocker will oscillate the ribbon-vibrating mechanism through various distances, said means comprising a lever and a pin on one end of said lever co-operating with the forked end of the link to move the member on said link to various portions of the slot.

6. In a typewriting machine, the combination of a ribbon-vibrating mechanism, an escapement mechanism including a dogrocker mounted for movement about a vertical axis, a horizontal member fixed to said dog-rocker to move therewith and having an elongated slot, a linkage attached to said ribbon-vibrating mechanism and comprising a link having a forked end and a member adapted to co-operate with said slot,

means for moving said member to various portions of said slot so that movements of the rocker will oscillate the ribbon-vibrating mechanism through various distances, said means comprising a lever and a pin on one end of said lever co-operating with the forked end of the link to move the member on said link to various portions of the slot, and spring-guiding and holding means for the end of said lever.

7. In a typewriting machine, the combination of a ribbon-vibrating mechanism, an escapement mechanism including a dogrockcr mounted for movement about a vertical axis, a horizontal member fixed to said dog-rocker to move therewith and having an elongated slot, a linkage attached to said ribbon-vibrating mechanism and comprising a link having a forked end and a member adapted to co-operate with said slot, means for moving said member to various portions of said slot so that movements of the rocker will oscillate the ribbon-vibrating mechanism through various distances, said means comprising a lever and a pin on one end of said lever co-operating with the forked end of the link to move the member on said link to various portions of the slot, and spring-guiding and holding means for the end of said lever comprising a table fixed to the frame of the machine and two spring members on said table having their ends spaced apart, said lever being designed to co-operate in its extreme positions with one or the other of said spring members and in its neutral position in the space between said members. I

8. In a typewriting machine, the combination of a ribbon-vibrating mechanism, an escapement mechanism including a dog-rocker mounted for movement about a vertical axis, a horizontal member fixed to said dog-rocker to move therewith and having an elongated slot, a linkage comprising a bell-crank mounted for movement in a vertical plane, the end of one arm of said bell-crank being in engagement with the lower end of the ribbon-vibrating mechanism, a link pivoted on the other arm for horizontal movement,

said link having a member co-operating with said slot and having its end forked, and

means for moving said co-operating member to various portions of the slot so that movements of the rocker will oscillate the ribbon-vibrating mechanism through various distances, said means com rising a lever'and a in on one end of sai lever cooperating wlth the forked end of the link to move the co-operating member to various portions of the slot.-

9. In a typewriting machine having a stationary frame and a shiftable frame, the combination of a ribbon-vibrating mecha nism, an escapement mechanism including a dog-rocker mounted for movement about a vertical axis, a horizontal member fixed to said dog-rocker to move therewith and having an elongated slot, a linkage comprising a link having a forked end, a member adapted to co-operate with said slot, and means for moving said member to various portions of the slot so that movements of the rocker will oscillate the ribbon-vibrating mechanism through various distances, said means comprising a lever and a pin on one end of said lever co-operating with the forked end of the link to move the member on said link to various portions of the slot, said dogrocker, ribbon-vibrating mechanism and linkage being mounted in the shiftable frame, said lever and pin being mounted in the stat1onary frame, and said pm being of such length as to co-operate with the forked portion of the link even when the shiftable frame is in the shifted position.

10. In a typewriting machine, the combination of a vertically movable ribbon-vibrator, an actuating lever connected to said ribbon-vibrator to operate in a plane parallel to the plane in which the ribbon- .vibrator moves, an arm on said lever, an escapement mechanism including a dogrocker mounted for movement about a vertical axis, a horizontal arm fixed to said dogrocker to move therewith, a link pivoted to one of said arms, the. other arm having an elongated slot, said link having a member adapted to co-operate with said slot, and means for shifting said link to move said member to various portions of the slot so that the same extent of horizontal movement of the dog-rocker will move the ribbon-vibrator vertically through various distances, saidslot being enlarged at the center in a direction away from the co-operating member forming a lost-motion connection so that movement of said dog-rocker will not transmit motion to the link when in this position.

,11. In a typewriting machine, the combination of a ribbon-vibrating mechanism, an escapement mechanism including a dogrocker mounted for movement about a vertical axis, a horizontal member fixed to said dog-rocker to move therewith and having an elongated slot, a linkage attached to said ribbon-vibrating mechanism and comprising a link having a forked end and a member adapted to co-operate withsaid slot, and means for moving said member. to various portions of the slot so that movements of the rocker will oscillate the ribbon-vibrating mechanism through various distances, said means comprising a lever and a pin on one rocker mounted for movement about a ver-.

tical axis, a horizontal member fixed to said dog-rocker to move therewith and having an elongated slot, a linkage comprising a bell-crank mounted for movement in a vertical plane, the end of one arm of said bellcrank being in engagement with the lower end of the ribbon-vibrating mechanism, a link pivoted on the other arm for horizontal movement, said link having a member co-operating with, said slot and having its end forked, and means for moving said co-operating member to various portions of the slot so that movements of the rocker will oscillate the ribbon-vibrating mechanism through various distances, said means cornrising a lever and a pin on one end of said ever co-operating with the forked end of the link to move the co-operating member to va rious parts of the slot, and said slot being enlarged at the center in a direction away from the co-operating member forming a lost-motion connection so that movement of said dog-rocker will not transmit motion to the link when in this osition.

- ALFRED G. KURCWSKI. Witnesses:

CATHERINE A. NEWELL, JENNIE P. THORNE. 

